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Securities - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule Of Securities [Line Items]    
Available for Sale, Due in one year or less, Amortized Cost     
Available for Sale, Due from one to five years, Amortized Cost 209,474  
Available for Sale, Due from five to ten years, Amortized Cost 150,871  
Available for Sale, Due after ten years, Amortized Cost 46,182  
Available for Sale, with contractual maturities, Amortized Cost 406,527  
Total securities available for sale, Amortized Cost 1,139,696 1,170,439
Available for Sale, Due in one year or less, Fair Value     
Available for Sale, Due from one to five years, Fair Value 209,523  
Available for Sale, Due from five to ten years, Fair Value 147,783  
Available for Sale, Due after ten years, Fair Value 37,553  
Available for Sale, with contractual maturities, Fair Value 394,859  
Total available for sale Securities, Fair Value 1,115,558 1,172,683
Held to Maturity, Due in one year or less, Amortized Cost 2,461  
Held to Maturity, Due from one to five years, Amortized Cost 34,366  
Held to Maturity, Due from five to ten years, Amortized Cost 65,749  
Held to Maturity, Due after ten years, Amortized Cost 76,377  
Securities Held To Maturity, with contractual maturities, Amortized Cost 178,953  
Held to Maturity, with contractual maturities, Amortized Cost 1,180,992 1,106,563
Held to Maturity, Due in one year or less, Fair Value 2,483  
Held to Maturity, Due from one to five years, Fair Value 34,162  
Held to Maturity, Due from five to ten years, Fair Value 66,086  
Held to Maturity, Due after ten years, Fair Value 76,490  
Securities Held To Maturity, with contractual maturities, Fair Value 179,221  
Held to Maturity, with contractual maturities, Fair Value 1,181,652 1,143,213
Agency Mortgage-Backed Securities [Member]
   
Schedule Of Securities [Line Items]    
Total securities available for sale, Amortized Cost 223,125 267,575
Total available for sale Securities, Fair Value 227,638 275,150
Held to Maturity, with contractual maturities, Amortized Cost 650,732  
Held to Maturity, with contractual maturities, Fair Value 662,997  
Agency Collateralized Mortgage Obligations [Member]
   
Schedule Of Securities [Line Items]    
Total securities available for sale, Amortized Cost 506,672 465,574
Total available for sale Securities, Fair Value 489,047 469,547
Held to Maturity, with contractual maturities, Amortized Cost 341,743  
Held to Maturity, with contractual maturities, Fair Value 329,714  
Non-Agency Collateralized Mortgage Obligations [Member]
   
Schedule Of Securities [Line Items]    
Total securities available for sale, Amortized Cost 1,818 2,679
Total available for sale Securities, Fair Value 1,846 2,729
Held to Maturity, with contractual maturities, Amortized Cost 7,317  
Held to Maturity, with contractual maturities, Fair Value 7,370  
Commercial Mortgage-Backed Securities [Member]
   
Schedule Of Securities [Line Items]    
Total securities available for sale, Amortized Cost     
Total available for sale Securities, Fair Value     
Held to Maturity, with contractual maturities, Amortized Cost 2,247  
Held to Maturity, with contractual maturities, Fair Value 2,350  
Equity Securities [Member]
   
Schedule Of Securities [Line Items]    
Total securities available for sale, Amortized Cost 1,554 1,554
Total available for sale Securities, Fair Value 2,168 2,007
Held to Maturity, with contractual maturities, Amortized Cost     
Held to Maturity, with contractual maturities, Fair Value